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I have a double wide mobile home with existing slider and replacing it with french doors. The size is going from 71 1/2 x 76 to 71 1/2 x 80. I don't believe that there are cripple studs above the header, just a solid header.

My idea is to cut into the header a bit more than needed for the door to allow me to add a new plate under what is left of the header instead of replacing the header. Is that a sufficient fix? Should I not use wood but use a steel plate under the header?

Thank you

  • Hello, and welcome to Home Improvement. It's a little hard to picture what you're talking about; would you add a diagram and/or pictures? And, you should probably take our tour so you'll know how best to participate here. – Daniel Griscom Oct 1 at 15:38
  • Voting to close. We don't have nearly enough information to assess this, and therefore it becomes a matter of opinion (which is specifically off-topic on DIYSE). – isherwood Oct 2 at 21:11
  • I think there is enough information to say it is a bad idea. How often have you cut +4-1/2 inches into a header of any kind? – Ed Beal Oct 2 at 22:31
  • What is the span of the ceiling/roof joists resting on the existing header? – Lee Sam Oct 2 at 23:42
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I would not cut into the header, steel plate is very weak with a load on its flat side. I beams get their strength from the width and thickness of the Webb. I could stand on a 6’ long 4” wide 3/8” steel plate and bend it so no I would not Do this.

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I would replace the header if you're going to do this. As Ed Beal said, steel is weaker on its flat side - so is wood for that matter. IIRC a door that wide should have a 12" thick header, although maybe mobile homes have different rules.

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